JJ vs 64s: Odds & Interactive Calculator
| Hand | Win | Tie | Equity |
|---|---|---|---|
| JJ (Pocket Jacks) | 79.3% | 0.4% | 79.6% |
| 64s (Six-Four Suited) | 20.2% | 0.4% | 20.4% |
How JJ vs 64s unfolds by street
Pocket Jacks (JJ) is still ahead on 94% of flops against 64s, and the lead survives to the turn on 88%. 64s takes the lead on the other 6% of flops. These figures come from full board enumeration, not a simulation.
| Street | JJ still ahead | 64s flipped the lead |
|---|---|---|
| Flop | 94% | 6% |
| Turn | 88% | 12% |
JJ vs 64s is the "big pair against live cards" spot: JJ wins 79.3%, 64s wins 20.2%, and 0.4% of boards chop. Even at a 3.9-to-1 deficit, 64s keeps about 20.2% because suited connectors attack three ways at once — pairing either card, completing a straight, or filling the flush.
Here's the intuition behind 79.6% to 20.4%: JJ wins roughly 4 of every 5 times the chips go in, but the underdog cashing 20.4% of the time is exactly why you can't slow-play and let it draw for free.
JJ should play this fast and deny equity: every free card helps 64s more than it helps you. If you're the one with the suited connectors, lean on implied odds and fold equity rather than the raw 20.2% — the hand's value is in the pots you take away postflop, not in flipping all-in preflop.
JJ vs 64s FAQ
Who wins JJ vs 64s preflop?
JJ (Pocket Jacks) is the favorite, winning 79.3% of all runouts, while 64s (Six-Four Suited) wins 20.2%. The remaining 0.4% are split pots. Counting splits as half, JJ's preflop equity is 79.6%.
Does the JJ vs 64s probability change all-in preflop?
No. Once both hands are all-in preflop the odds are set by the cards alone — position, stack size and who bet first change nothing. The only thing that moves the number is suits: JJ's equity runs from 79.0% to 80.1% depending on how many suits the two hands share, which is why different sites quote slightly different figures. It does change once board cards are dealt (JJ leads on 94% of flops) and in multiway pots, where every extra caller takes equity from both hands.
Are suited connectors good against JJ?
Better than almost any other underdog: 64s holds 20.4% equity against JJ thanks to its straight and flush potential — roughly 1 win in 5. That equity is realized best with position and fold equity postflop, not by jamming all-in preflop where the overpair is a 3.9-to-1 favorite.
Does JJ hold up against 64s after the flop?
JJ is still ahead on 94% of flops and stays ahead through the turn on 88% of boards; 64s takes the lead on the other 6% of flops. These are exact figures from full board enumeration.
Run any matchup in the free equity calculator · AA VS 54S · AA VS 87S · AA VS 98S · AA VS T9S · AA VS JTS · AA VS 75S
JJ against a range
All-in against one known hand is the textbook case; at the table JJ is usually up against a range. Exact equities, computed over every combo with card removal applied:
- JJ vs calling station — 71.9% against 670 combos (50.5% of hands)
- JJ vs BTN open — 70.9% against 586 combos (44.2% of hands)
- JJ vs SB open — 70.0% against 534 combos (40.3% of hands)
- JJ vs CO open — 68.5% against 366 combos (27.6% of hands)